(Internet) A metadata tag, signaled by a preceding hash sign (#), used to label content. / (Internet, informal) The hash sign itself, when used as part of a hashtag.

(transitive, Internet) To label (a message) with a hashtag.

plural of hashtag

simple past tense and past participle of hashtag

present participle of hashtag

plural of hashtagger

(Internet) One who uses hashtags.

(Internet) Suitable for use as a hashtag.